* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: 微软雅黑;
    color:#fff;
    user-select: none;
}

body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: rgb(198, 146, 146);
     /*background-image: linear-gradient(135deg, #CE9FFC 10%, #7367F0 100%); */
    justify-content: center;
    align-items: center;
}

.container {
    display: flex;
    flex-direction: column;
    text-align: center;
    box-shadow: inset 0 0 15px 0 #fff;
    border-radius: 15px;
    padding: 2rem;
}

.header {
    font-size: 4rem;
    font-weight: bold;
}

.day,
.hour,
.minute,
.second {
    /* 行内块让块内容显示在一行 */
    display: inline-block;
    width: 200px;
    font-size: 3.3rem;
    background: rgba(255, 255, 255, 0.1);
}

#year {
    font-size: 10rem;
}

#btn {
    position: relative;
    top: 1rem;
    font-size: 2rem;
    font-family: Consolas, 'SimHei', monospace;
    border: none;
    border-radius: 5rem;
    padding: 1rem 5rem;
    cursor: pointer;
    background: rgba(255,255,255,0.4);
}